[patch] allow '-' for stdout dump

[Nathan Sidwell]

On 04/26/2018 01:31 PM, Sandra Loosemore wrote:

> Hmmm, I'm not crazy about putting this material in the middle of a discussion 
> about how the compiler comes up with its default dump file names.  How about 
> splitting the existing paragraph into 3:

Yeah, that documentation is rather a mess.  I tried rationalizing the developer 
options into different subsections, but that quickly turned into a rat hole. 
Here I've just pulled out the filename creation to an earlier paragraph.

WDYT?

nathan
-- 
Nathan Sidwell
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